I collaborate with scientists, lawyers, engineers, and program administrators to develop evidence-based environmental programs and to understand causal relationships, both natural and anthropogenic, in complex environments. My research aims to incorporate insights from the behavioral and social sciences into the designs of public programs and to measure the causal effects of human behaviors on the environment and human welfare. I believe that these topics require contributions from multiple disciplines and multiple methodologies. More recently, building on my earlier training in the natural sciences, I have collaborated with natural and physical scientists to elucidate causal relationships in ecological and hydrological systems.